siemens - Public Service Commission

June 2007 5- 1 0738953 1
5.0 EFFECTS OF PLANT OPERATION
5.1 Effects of the Operation of the Heat Dissipation System
5. I. 1 Temperature Effect on Receiving Body of Water
As described in Section 3.5, the final condenser cooling water flow rate for CR3 has not been
determined, however, the potential will range up to a maximum expected flow rate of 830,000
gpm from the current 680,000 gpm. The corresponding flow rate for CR I, 2, and 3 will thus
range up to 1,468,000 gpm (potential maximum). The use of the proposed new SCT will ensure
that the heat rejection rate from the three units will be limited so as not to exceed the present
maximum rate of 10.91 Billion Btu per hour at the POD. Because the temperature rise is
proportional to the heat rejection rate, the full load temperature rise at the maximum expected
flow rate, without the use of the HCT but using the recirculating portion of the new SCT, will be
13.79 "F.
Since the discharge temperature from CR 1,2 and 3 prior to use of the new SCT is estimated to
range between the present value of up to 16.74" F, to a future value between 13.79 " F and 16.74 O
F, there is not expected to be any measurable impact due to change in combined flow discharge
temperature. Also, because the total quantity of heat rejected via the discharge canal at the POD
is not changing, the shape and extent of the thermal plume (the location and amount of acreage
enclosed within each temperature isotherm) is not expected to change with the CR3 Uprate
Project.
5.1.2 Effects on Aquatic Life
PEF has been in the process of quantifying baseline aquatic impingement and entrainment
impacts at the CREC in order to develop a Comprehensive Demonstration Study (CDS) for
submittal to the FDEP in compliance with the federal Clean Water Act 316(b) rule. However, the
U.S. Court of Appeals for the Second Circuit recently remanded most of the substantive portions
of the USEPA's July 2004 3 l6(b) Rule. PEF anticipates that EPA will re-promulgate the Phase I1
3 I6(b) regulations at some time in the future. In the interim, PEF intends to continue to evaluate
impingement and entrainment impacts associated with the CR3 Uprate Project within the CREC
existing monitoring program. This data will be used to evaluate impacts and identify measures to
reduce aquatic impacts during the next CREC NPDES pennit renewal (scheduled in late 2009).
Golder Associates
PEF-NCR-00677